Nitrogen, Phosphorus, and Potassium Availability in Manure- and Sewage Sludge–Applied Soil

Abstract

A field experiment with wheat (Triticum aestivum L.) was established over two growing seasons where farmyard manure and sewage sludge, along with conventional fertilizer, were added to soil. We found that ammonium N was at greater concentrations in the organic amendments treatments, indicating more beneficial dynamics (i.e., it can be taken up by plants for a greater amount of time) and thus a longer lasting effect as a nutrient for the test crop. We found that nitrogen (N), phosphorus (P), and potassium (K) uptake increased with added organic amendments. This means that when organic matter along with nutrients are added to soil, productivity may increase beyond preset targets because soil conditions greatly improve, not only chemically but also physically. Nitrates left over at the end of the growing season (residual N) were greater in the high sewage sludge and manure treatments, but not proportionally.

Do Application Rates of Wastewater Sewage Sludge Affect the Removal of PAHs from Alkaline Saline Soil?

“…In soil spiked with PAHs, the concentration of NO 3 -decreased over time and reached a minimum after 28 days. Afterward, the concentration of NO 3 -increased again. The application of wastewater sludge to the PAHs spiked soil had no significant effect on the concentrations of NO 3 -independent of the amount added.…”

“…Sludge water was removed by air drying. The amount of wastewater added was such that approximately 0, 50, 150, 300, and 600 kg N ha -1 was added considering a soil density of 1.3 kg dm 3 for a 15 cm soil layer and 40% of the organic N was mineralized during the experiment. Proportional amounts of distilled water were then added to all treatments so that the same water content (approximately 40% WHC) was obtained in each treatment.…”

“…The question remains if the amount of wastewater sludge applied to a soil will affect the removal of phenanthrene (Phen) and anthracene (Anthra). As part of a study into the removal of PAHs from an alkaline saline soil using organic wastes, soil of the former lake Texcoco with EC 7.6 dS m -1 and pH 9.7 was spiked with Phen and Anthra and amended with 0, 1.5, 4.5, 9, or 18 g dry wastewater sludge kg -1 , i.e., 0, 3, 9, 18, and 36 tons dry sludge ha -1 , which was equivalent to approximately 0, 50, 150, 300, and 600 kg N ha -1 added to the 0-15 cm soil layer with density 1.3 kg dm 3 , considering that 40% of the organic N was mineralized. Emissions of CO 2 ; concentrations of inorganic N (ammonium (NH 4 + ), nitrite (NO 2 -), and nitrate (NO 3 -); and Phen and Anthra were monitored in an aerobic incubation at 22±2ºC for 56 days.…”

Benthic Foraminifera in Eastern Bahrain: Relationships With Local Pollution Sources

“…The relatively high concentrations of pollutants could be attributed to boat traffic, domestic sewage discharge, and waste coming from mariculture (i.e., the National Mariculture Center). In addition, the biological decomposition of sewage waste produces biological nutrients, especially nitrates, along with liberation of organic carbon under aerobic conditions [23]. It has been well-established that the distribution of foraminifera in coastal environments is a function of nutrients, organic matter, and hydrocarbons as well as other physicochemical parameters [24].…”

Ivy pelargonium response to media containing sewage sludge and potato pulp

“…The beneficial effects of biosolids application on the growth and N uptake of spring barley may also be attributed to the supply of micronutrients (Esperschuetz et al 2016a), and to the improvement of soil biological activity (Elbl et al 2014, Plošek et al 2017. Thus, biosolids provide more benefits than mineral fertilisers, especially in semiarid conditions and in soils that are low in organic matter, which is a common feature in the Mediterranean region (Antolin et al 2005, Antoniadis et al 2015.…”